Malicious PDF — malware analysis report

Static analysis result for SHA-256 ecdbcbd80d1bd3f0…

MALICIOUS

PDF

37.4 KB Created: 2020-11-09 14:44:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 7d54a27e382e58b91b95bb803d21b558 SHA-1: 54110cd4dd77e7bd329b10660d75e96e26931e7e SHA-256: ecdbcbd80d1bd3f04fe7f2e89ca2f0c5d0e1978c961e6eac4f432fb9b2c1f2eb
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was flagged as malicious by an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://trafffi.ru/aws?keyword=memorial+day+closed+sign+free PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4369930/normal_5f8815b7c3e7a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372073/normal_5fa89c609071e.pdfIn PDF document text
    • https://nonudefetug.weebly.com/uploads/1/3/4/3/134314303/c3c27b17bc4732.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/83f915b9-c075-450e-92f0-e666769aca38/33269064894.pdfIn PDF document text
    • https://s3.amazonaws.com/pazifetanegapu/60678133778.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8bfb0fde-9dd4-4a02-99fa-e67c424f8f14/giraffe_eating_acacia_tree.pdfIn PDF document text
    • https://s3.amazonaws.com/potamotaz/77459197881.pdfIn PDF document text
    • https://s3.amazonaws.com/bejokazemur/58837393094.pdfIn PDF document text
    • https://s3.amazonaws.com/xukidosifixi/35217607901.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cb476ded-86b1-49c9-8ad9-3141caa125c5/ganigonutiwekobulozizami.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/64188743-9f1b-4342-a65d-e437957f6bf5/exergen_temporal_thermometer_battery_cover.pdfIn PDF document text
    • https://s3.amazonaws.com/gumegulaxi/41798537076.pdfIn PDF document text
    • https://s3.amazonaws.com/gupuso/haloalkanes_and_haloarenes_notes_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/719dd3dd-ec07-4591-9777-01b32dbab807/35842028932.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000545d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x545D 5448 bytes
SHA-256: 26a2819266920aabceaf10cc0fe44a1f36eb78706ca0f60d3e282dee36bc34d8
font_01_sfnt_off000066e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x66E0 9964 bytes
SHA-256: e469bf230d28bc90a8c7517b1b12acd2561841c7ae868d578f6528b26242dba3